Those old init scripts weren't simple - to do anything useful you had to copy and paste a whole heap of sh boilerplate...
This is my regular problem in systemd arguments. I understand learning init script - and bash as a consequence - can be tiring, but judging a software by how easy or not is it to configure is utterly and fundamentally wrong.
After a certain point, systemd is not easier to configure than any earlier system; nor is it any more stable, or, god forbid, easier to replace a part of it.
Please stop glorifying things that you're only touched the surfaces of.
I don't care if it's easy to replace bits of - the people who produce the distribution I use can worry about that. All I care about is that it has worked really well for me in production and I have found it much easier to use and maintain than older systems.